the "U" designation typically refers to universal retail packaging

the 600VAC rating is the maximum allowable voltage

to access the internal sensitivity slider or calibration port screws for HVACR maintenance

it provides superior thermal conductivity and corrosion resistance

Key Benefits OEM Compatibility: Direct factory replacement ensures proper mounting alignment and terminal orientation for Goodman furnace parts

Resideo Q340A1066 Thermocouple the "U" designation typically refersThe Resideo Q340A1066 is a professional grade Universal 30mV Thermocouple designed for high reliability pilot flame sensing in standing pilot gas fired heating systems. This 18 inch thermocouple features a heavy duty construction with a focus on Maximum Copel content to ensure long term durability and consistent millivolt generation. When the pilot flame contacts the tip, the resulting temperature differential produces a stable 26mV 32mV open circuit